Hydroxy-Directed Diastereoselective Installation of a Methyl Group on Indalone Models and Spiroketal Potential Precursors for the Bafilomycin A<sub>1</sub> C15−C25 Subunit
installation of the methyl-16 cis with respect to the vicinal OH-15 group through radical opening of either siloxafuran intermediate 7 or cyclopropyl compounds 9 and 13 have been carried out using model compounds derived from commercial Indalone 6. In each case the expected "cis" diastereoisomer was obtained in good to excellent yield. Application of these results to Bafilomycin A(1) synthon led to the opposite